The .env.example environment configuration file is missing

[snake-fan]

Maybe you can add a .env.example file to help with setup.

[LennoxDai]

Done in 5bd4cf7 — thanks for the suggestion!

[Derekko-web]

Opened #15 as a follow-up: it expands the new .env.example to cover the runner/env vars used across harnesses and adds the README copy step.